The National Hurricane Center (NHC) projected that the weather system - which, if it escalates to a tropical storm, would be named Arthur - will form near the Bahamas after producing showers and thunderstorms across South and Central Florida.
The National Hurricane Center sent its Air Force Reserve Hurricane Hunter aircraft into a disturbance churning just south of the Florida Keys and the north end of the Bahamas on Saturday morning. This system will likely become a tropical or subtropical depression this weekend and if it becomes a storm, it will be named Arthur.
The storm was moving north north-east at 8 knots with maximum sustained winds of 40 knots.
This system is expected to move across the Outer Banks of North Carolina on Monday.
The National Hurricane Center has issued a Tropical Storm Watch from New River Inlet to Duck, N.C., including Pamlico and Albemarle Sounds.
The NWS's Newport/Morehead office, which covers the Outer Banks, expects winds between 25 and 35 miles per hour, with gusts up to 50 mph.
The Fort Lauderdale area of Broward County saw the most rain, with 2 to 3 inches reported.
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Localized storm surge and flooding are also possible in the area, the NWS says. But threats remain limited. Continued gradual development is expected, and the system is likely to become a tropical or subtropical depression or storm later today or tonight while it moves north-northeastward over the Atlantic waters east of Florida. Land impacts should be minimal.
Those planning to head to the beach before the rain arrives should be aware of the risk of rough surf and strong rip currents.
Hazardous marine conditions, too, And these will spread northward Saturday into Monday, likely causing unsafe surf and rip currents along much of the southeast and mid-Atlantic coasts of the U.S.
"On the forecast track, Arthur will remain well offshore the east coast of Florida, Georgia, and SC today, and then move near or just east of the coast of North Carolina on Monday". A few showers will linger Saturday and Sunday but with warmer sun, then a few afternoon storms.
In that time frame, "some strengthening" is expected, the agency said.
Mr Caines added, Due to Covid-19, the Emergency Measures Organisation has been meeting on a regular basis, and tomorrow as part of our normally scheduled meeting, Tropical Storm Arthur will feature prominently in our discussions..